Potassium-40 is useful inn determining the age of a fossil in samples
A. 300,000 years of age and older
B. Less than 25,000 years of age
C. Aged between 50,000 and 100,000 years of age
D. Aged between 100,000 years and 250,000 years
E. Of 40,000 to 50,000 years of age
A. 300,000 years of age and older
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A pea plant is heterozygous (Aa) for seed color and heterozygous (Bb) for seed shape. According to Mendel's principle of independent assortment:
A. each gamete will have either a seed color allele or a seed shape allele. B. a gamete that receives the dominant allele for seed color will also receive the dominant allele for seed shape 100% of the time. C. a gamete that receives the dominant allele for seed color is equally likely to receive the dominant allele for seed shape as it is the recessive allele for seed shape. D. possible gamete phenotypes are Aa, Bb, AB, and ab; each is equally likely to occur. E. possible gamete phenotypes are AB or ab; each is equally likely to occur.
When a plant moves sugars from its leaves to its roots, the sink is the
a) leaves. b) roots. c) stems. d) same as the source.
Which of the following bacterial groups is thought to be most closely related to the last universal common ancestor?
A) Alphaproteobacteria B) cyanobacteria C) deeply branching bacteria D) green filamentous bacteria
All viruses and phages have ________
a. capsids and envelopes b. genomes and envelopes c. genomes and capsids d. capsids, envelopes, and genomes